Background: This paper considers the breast cancer screening programme in t
he autonomous community of Navarre, Northern Spain. Women from different ar
eas of Northern, Central and Southern Navarre are Involved. Methods: A samp
le of 512 women participants and 196 non-participants was taken from a tota
l of 60,908 women between 45 and 65 years of age who received an invitation
to attend the breast cancer screening programme. The participants were ask
ed to fill in an individual structured questionnaire in their local Health
Centre and the non-participants in their homes. This was done retrospective
ly. Results: The response rate was 100% for participants and 83.9% for non-
participants. This study investigates the attitude profiles of the women at
tending mammography mass screening, with non-attending women (matched in ed
ucational and occupational levels) as controls. Subjects were assessed on d
imensions such as attitudes towards health and illness. The results support
Rosenstock's 1974 model that perceived severity of breast cancer and perce
ived susceptibility to breast cancer are related to participation in screen
ing. Furthermore, results demonstrated that hypochondriacal beliefs, diseas
e phobia and feared effects of symptoms were related to decreased participa
tion levels. Conclusion: This study has explored the implication of health
belief attitudes and the attitudes toward illness variables with women's pa
rticipation in a breast cancer screening programme. It assesses the relativ
e contribution of these variables to levels of participation, and the resul
ts of the study indicate that belief sets and attitudes are important compo
nents of women's cancer prevention behaviours.